212312221 has 8 divisors (see below), whose sum is σ = 231789600. Its totient is φ = 192864240.

The previous prime is 212312173. The next prime is 212312231. The reversal of 212312221 is 122213212.

It is a happy number.

212312221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212312221 - 2⁹ = 212311709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212312195 and 212312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212312231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9435 + ... + 22663.

It is an arithmetic number, because the mean of its divisors is an integer number (28973700).

Almost surely, 2^212312221 is an apocalyptic number.

It is an amenable number.

212312221 is a deficient number, since it is larger than the sum of its proper divisors (19477379).

212312221 is a wasteful number, since it uses less digits than its factorization.

212312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699.

The product of its digits is 96, while the sum is 16.

The square root of 212312221 is about 14570.9375470489. The cubic root of 212312221 is about 596.5657707669.

Adding to 212312221 its reverse (122213212), we get a palindrome (334525433).

Subtracting from 212312221 its reverse (122213212), we obtain a palindrome (90099009).

The spelling of 212312221 in words is "two hundred twelve million, three hundred twelve thousand, two hundred twenty-one".